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Rambutan is a family of encryption technologies designed by the Communications-Electronics Security Group (CESG), the technical division of the United Kingdom government's secret communications agency, GCHQ.

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  • Rambutan (kriptografi) (in)
  • Rambutan (cryptography) (en)
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  • Rambutan adalah suatu set perangkat teknologi enkripsi yang dirancang oleh Communications-Electronics Security Group (CESG), divisi teknis dari agen komunikasi rahasia Pemerintah Britania Raya, GCHQ (badan intelijen Britania Raya). (in)
  • Rambutan is a family of encryption technologies designed by the Communications-Electronics Security Group (CESG), the technical division of the United Kingdom government's secret communications agency, GCHQ. (en)
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  • Rambutan is a family of encryption technologies designed by the Communications-Electronics Security Group (CESG), the technical division of the United Kingdom government's secret communications agency, GCHQ. It includes a range of encryption products designed by CESG for use in handling confidential (not secret) communications between parts of the British government, government agencies, and related bodies such as NHS Trusts. Unlike CESG's Red Pike system, Rambutan is not available as software: it is distributed only as a self-contained electronic device (an ASIC) which implements the entire cryptosystem and handles the related key distribution and storage tasks. Rambutan is not sold outside the government sector. Technical details of the Rambutan algorithm are secret. Security researcher Bruce Schneier describes it as being a stream cipher (linear-feedback shift register) based cryptosystem with 5 shift registers each of around 80 bits, and a key size of 112 bits. RAMBUTAN-I communications chips (which implement a secure X.25 based communications system) are made by approved contractors Racal and Baltimore Technologies/Zergo Ltd. CESG later specified RAMBUTAN-II, an enhanced system with backward compatibility with existing RAMBUTAN-I infrastructure. The RAMBUTAN-II chip is a 64-pin quad ceramic pack chip, which implements the electronic codebook, cipher block chaining, and output feedback operating modes (each in 64 bits) and the cipher feedback mode in 1 or 8 bits. Schneier suggests that these modes may indicate Rambutan is a block cipher rather than a stream. The three 64 bit modes operate at 88 megabits/second. Rambutan operates in three modes: ECB, CBC, and 8 bit CFB. (en)
  • Rambutan adalah suatu set perangkat teknologi enkripsi yang dirancang oleh Communications-Electronics Security Group (CESG), divisi teknis dari agen komunikasi rahasia Pemerintah Britania Raya, GCHQ (badan intelijen Britania Raya). Perangkat ini mencakup serangkaian produk enkripsi yang dirancang oleh CESG untuk digunakan dalam menangani komunikasi konfidensial (bukan rahasia) antara bagian pemerintah Inggris, lembaga pemerintah, dan badan terkait seperti . Tidak seperti sistem CESG, Rambutan tidak tersedia sebagai perangkat lunak, tetapi didistribusikan hanya sebagai perangkat elektronik mandiri (ASIC - sirkuit terpadu khusus aplikasi) yang mengimplementasikan seluruh cryptosystem dan menangani distribusi kunci serta tugas penyimpanan terkait. Rambutan tidak dijual diluar sektor pemerintahan. Detail teknis dari algoritme Rambutan bersifat rahasia. Peneliti keamanan Bruce Schneier menggambarkannya sebagai stream cipher (linear feedback shift register) berbasis cryptosystem dengan 5 shift register masing-masing sekitar 80 bit, dan kunci berukuran 112 bit. Chip komunikasi RAMBUTAN-I (yang menerapkan sistem komunikasi aman berbasis X.25) dibuat oleh kontraktor yang disetujui dan Baltimore Technologies / Zergo Ltd. CESG kemudian menetapkan RAMBUTAN-II, sistem yang disempurnakan dengan kompatibilitas mundur dengan infrastruktur RAMBUTAN-I yang ada sebelumnya. Chip RAMBUTAN-II adalah chip 64-pin, yang mengimplementasikan codebook elektronik, rantai blok sandi, dan umpan balik keluaran (masing-masing dalam 64 bit) dan mode umpan balik sandi dalam 1 atau 8 bit. Menurut Schneier, mode-mode ini dapat menjadi indikasi bahwa Rambutan adalah , bukan stream chiper. Tiga mode 64 bit beroperasi pada 88 megabit/detik. Rambutan beroperasi dalam tiga mode: ECB, CBC, dan 8 bit CFB. (in)
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