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Only a decoder with the correct secret BISS-key will be able to decrypt a BISS-E feed. This session key is then mathematically combined internally to calculate a BISS-1 key that can decrypt the signal. The user is then sent a 16-digit hexadecimal code, which is entered as a "session key". This is unknown to the user of the decoder. BISS-E (E for encrypted) is a variation where the decoder has stored one secret BISS-key entered by for example a rights holder.The key is entered into both the encoder and decoder, this key then forms part of the encryption of the digital TV signal and any receiver with BISS-support with the correct key will decrypt the signal. BISS-1 transmissions are protected by a 12 digit hexadecimal "session key" that is agreed by the transmitting and receiving parties prior to transmission.There are mainly two different types of BISS encryption used: Fields for entering BISS-keys on an Ericsson RX8200 IRD